Ball point pen



FIG. 1 is a front elevational view of a ball point pen showing my new design with the writing tip in the retracted position;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a front elevational view thereof with the writing tip in the protracted writing position. 

The ornamental design for a ball point pen, substantially as shown and described. 